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September 21, 2014

September 21, 2014

Posted by **What is wrong with it?** on Sunday, February 19, 2012 at 6:14pm.

Recall that the volume of a right circular cone with height h and radius of the base r is given by v= 1/3pi(r)^2h

okay so this is what i did and got but it isnt right and i dont know why...

20 = pi/4 3(19)^2 * dH/dt

and i solved for dH/dt..and i got 80/1083pi which is 0.0235 but its wrong...why? thanks for the help!

- diameter versus radius -
**Damon**, Sunday, February 19, 2012 at 6:20pmYou said the base diameter and height were the same

then if the height is 1

the radius is 9.5 not 19

- Calculus (Math 2A) -
**Damon**, Sunday, February 19, 2012 at 6:22pmdiameter = 19, radius = 9.5

I mean

- Calculus (Math 2A) -
**bobpursley**, Sunday, February 19, 2012 at 6:24pmV= PI/3 (h)(h/2)^2=PI/12 h^3

dV/dt= PI/12 *3h^2 dh/dt

dh/dt= dV/dt*4/(PIh^2)

dh/dt= 20*4/(PI*19^2)=not your answer.

Take a close look at the difference

- Calculus (Math 2A) -
**Damon**, Sunday, February 19, 2012 at 6:32pmWhoops, pay attention to what bobpursley did.

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